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Recently, when i first start the car in the morning. I hear a whirring noise whenever i fully depressed the clutch. Its not very loud, and i have to turn off the radio and be driving under 25mph to hear it.
It goes away after about 5 mins of driving.

Is this just the clutch fluids warming up? Sounds like theres some sort of contact. I read somewhere its just the oil in the synchros are too thick and it causes them to grind?

It's the throw out bearing. There are videos of it on youtube, other threads about it on here, and plenty of replaced throw out bearings. I have the same noise too but it's only occasionally so I can't duplicate it to get it replaced. Everything seems to be fine with my clutch so I'm not going to get too worried about it unless I start having a problem. I've mentioned it to the stealership before so at the very least they have a record of me complaining.

WTF! I just started getting this noise too on my 2012, 1,500 miles! My RX-8 did the same thing, I replaced the bearing and it went out after about 1k miles also. I can tell you that if it's anything like the RX-8 was then it's going to get louder.

Just started having this happen to me on my 2011 WRX. Never had it happen last year when it was colder but this year it makes a noise whenever clutch is depressed. Does go away after 5 mins or so. I park in garage so not super cold or anything.

Are there any signs I should look out for that would indicate it is getting worse and needs replacing? And I assume this would be covered by warranty if it does? I haven't done any mods so wondering why this has just started this year.

These cars seem to do this, and it makes a little noise, but I don't know of anyone that actually had any significant failure because of it. A lot of people have it replaced, and then the noise comes back after a few weeks, and other people have lived with it for years.

Mine does it on start up as well, but as long as the clutch pedal feels good and my clutch is biting like it should, I'm not going to worry about it.

mine would make noise all the time with the clutch engaged. i ignored it for about 1.5-2 years.(i had no money at the time) I had it replaced along with clutch. he showed me it after he got it out. it felt real rocky. just a matter of time before ya gotta change it. id image it would be pretty bad if it failed.

I too have this noise sometimes first thing in the morning..when I was getting turbo work done at the dealership I mentioned it, and they said it was normal and gave my clutch the stamp of approval..any loud grinding banging noise and i would be worried..good luck